Ferroelectric Liquid Crystals from Bent-Core Molecules with Vinyl End Groups

New banana-shaped achiral compounds, 1,3-phenylene bis [4-{4-(alkenyloxy) phenyliminomethyl}benzoate]s were synthesized by varying the length of alkenyl group; their ferroelectric properties are described. The smectic mesophases, including a switchable chiral smectic C $(Sm\;C^*)$ phase, were charac...

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Published in:Bulletin of the Korean Chemical Society 2003, 24(3), , pp.274-278
Main Authors: 권순식, 김태성, 이종광, Sung-Tae Shin, Lee-Tack Oh, 최이준, Sea-Yun Kim, 창
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cited_by cdi_FETCH-LOGICAL-c322t-8da4689ff929b55dda219474164ac8396ab6ea7be4282c2931c95af870db89663
cites cdi_FETCH-LOGICAL-c322t-8da4689ff929b55dda219474164ac8396ab6ea7be4282c2931c95af870db89663
container_end_page 278
container_issue 3
container_start_page 274
container_title Bulletin of the Korean Chemical Society
container_volume 24
creator 권순식
김태성
이종광
Sung-Tae Shin
Lee-Tack Oh
최이준
Sea-Yun Kim
창
description New banana-shaped achiral compounds, 1,3-phenylene bis [4-{4-(alkenyloxy) phenyliminomethyl}benzoate]s were synthesized by varying the length of alkenyl group; their ferroelectric properties are described. The smectic mesophases, including a switchable chiral smectic C $(Sm\;C^*)$ phase, were characterized by differential scanning calorimetry, polarizing optical microscopy and triangular wave method. The presence of vinyl groups at the terminals of linear side wings in the banana-shaped achiral molecules containing Schiff's base mesogen induced a decrease in melting temperature and formation of the switchable $(Sm\;C^*)$ phase in the melt. The smectic phases having the octenyloxy group such as $(CH_2)_6CH=CH_2$ showed ferroelctric switching, and their values of spontaneous polarization on reversal of an applied electric field were 120 nC/cm² (X=H) and 225 nC/ cm² (X=F), respectively. We could obtain ferroelectric phases by controlling the number of carbon atom in alkenyloxy chain of a bent-core molecule. KCI Citation Count: 8
doi_str_mv 10.5012/bkcs.2003.24.3.274
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title Ferroelectric Liquid Crystals from Bent-Core Molecules with Vinyl End Groups
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